The following Information is available for a company's utility cost for operating its machines over the last four months, Month January February March April Machine hours 900 1,800 2,400 600 Utility cost $5,450 $6,900 $8, 100 $3,600 Using the high-low method, the estimated variable cost per machine hour for utilities is: Multiple Choice $3.38 $6.00 52 50 $422